#include <c8051f350.h> // SFR declarations
// MMC commands
#define MMC_GO_IDLE_STATE 0
#define MMC_SEND_OP_COND 1
#define MMC_SEND_CSD 9
#define MMC_SEND_CID 10
#define MMC_SEND_STATUS 13
#define MMC_SET_BLOCKLEN 16
#define MMC_READ_SINGLE_BLOCK 17
#define MMC_WRITE_BLOCK 24
#define MMC_PROGRAM_CSD 27
#define MMC_SET_WRITE_PROT 28
#define MMC_CLR_WRITE_PROT 29
#define MMC_SEND_WRITE_PROT 30
#define MMC_TAG_SECTOR_START 32
#define MMC_TAG_SECTOR_END 33
#define MMC_UNTAG_SECTOR 34
#define MMC_TAG_ERASE_GROUP_START 35
#define MMC_TAG_ERARE_GROUP_END 36
#define MMC_UNTAG_ERASE_GROUP 37
#define MMC_ERASE 38
#define MMC_CRC_ON_OFF 59
#define R1_BUSY 128
#define R1_PARAMETER 64
#define R1_ADDRESS 32
#define R1_ERASE_SEQ 16
#define R1_COM_CRC 8
#define R1_ILLEGAL_COM 4
#define R1_ERASE_RESET 2
#define R1_IDLE_STATE 1
sbit led1 = P0^7;
sbit led2 = P0^6;
sbit mmc_sck = P1^0;
sbit mmc_miso = P1^1;
sbit mmc_mosi = P1^2;
sbit mmc_cs = P1^3;
#define SYSmmc_sck 24500000 / 8 // SYSmmc_sck frequency in Hz
unsigned char xdata ram_data[512];
void PORT_Init (void);
unsigned char SPI_tx_rx(unsigned char spi_data);
unsigned char MMC_sendCmd(unsigned char cmd,unsigned char A31_24,unsigned char A23_16,unsigned char A15_8,unsigned char A7_0);
void MMC_finish(void);
void MMC_flush(unsigned char flush_num);
void MMC_reset(void);
unsigned char MMC_check(void);
unsigned long MMC_capactity(void);
void MMC_name(void);
//-----------------------------------------------------------------------------
// MAIN Routine
//-----------------------------------------------------------------------------
void main (void)
{
// disable watchdog timer
PCA0MD &= ~0x40; // 禁止看门狗
SP = 0x7F; // 设置堆栈
PORT_Init (); // Initialize crossbar and GPIO
OSCICN = 0xC0; // configure internal oscillator for
// its lowest frequency
RSTSRC = 0x04; // enable missing clock detector
MMC_reset();
while (MMC_check())
{
}
MMC_name();
while (1)
{
}
}
/********************端口初始化******************/
void PORT_Init (void)
{
XBR0 = 0x03; // 设置交叉开关
XBR1 = 0x40; //
P0MDOUT = 0xFD; //
P1MDOUT = 0xFD;
mmc_cs = 1;
mmc_mosi = 1;
mmc_sck = 1;
led1 = 0;
led2 = 0;
}
/***********SPI读取/写入****基础SPI传送命令******/
unsigned char SPI_tx_rx(unsigned char spi_data)
{
char i;
for (i=0;i<8;i++)
{
mmc_sck = 0;
if (spi_data >= 128) mmc_mosi = 1;
else mmc_mosi = 0;
mmc_sck = 1;
spi_data = ((spi_data << 1) & 0xFE) | mmc_miso;
}
return spi_data;
}
//------------------------------------------------------------------------------------
/***********MMC_sendCmd();*****基础传送命令*******/
//------------------------------------------------------------------------------------
uchar MMC_sendCmd(uchar cmd,uchar A31_24,uchar A23_16,uchar A15_8,uchar A7_0)
{
signed char temp;
mmc_cs = 0;
SPI_tx_rx(cmd|0x40); //cmd"01xxxxxx"
SPI_tx_rx(A31_24);
SPI_tx_rx(A23_16);
SPI_tx_rx(A15_8);
SPI_tx_rx(A7_0);
SPI_tx_rx(0x95); //crc for cmd0
SPI_tx_rx(0xff); //one empty cycle
temp=SPI_tx_rx(0xff); //0=busy
if ((temp-0x80)>=0) //0b1xxxxxxx=err
{
temp=0xff;
while (SPI_tx_rx(0xff)==0);
led1 = 1; //test point
}
else if (cmd==MMC_SEND_STATUS) //如果是读状态命令
{
temp=SPI_tx_rx(0xff); //read STATUS
while (SPI_tx_rx(0xff)==0);
led1 = 1;
}
else //是其他命令
{
while (SPI_tx_rx(0xff)==0);
led1 = 1;
}
return temp;
}
//------------------------------------------------------------------------------------
/***********MMC_finish();***停止卡片******/
//------------------------------------------------------------------------------------
void MMC_finish(void)
{
mmc_cs = 1;
SPI_tx_rx(0xff);
}
//------------------------------------------------------------------------------------
/***********MMC_flush();*****丢弃几个字节*******/
//------------------------------------------------------------------------------------
void MMC_flush(uchar flush_num)
{
uchar counter;
for (counter=0;counter<flush_num;counter++) SPI_tx_rx(0xff); //丢弃几个字节
MMC_finish();
}
//------------------------------------------------------------------------------------
/***********MMC_reset();***将MMC卡转到SPI模式****/
//------------------------------------------------------------------------------------
void MMC_reset(void)
{
uchar counter,mmc_response,lcd_add;
for (counter=0;counter<11;counter++) SPI_tx_rx(0xff);//80个时钟开始总线
mmc_response=MMC_sendCmd(MMC_GO_IDLE_STATE,0,0,0,0); //send cmd0
MMC_finish();
for (counter=0;counter<80;counter++) //失败尝试次数
{
mmc_response=MMC_sendCmd(MMC_SEND_OP_COND,0,0,0,0);
MMC_finish();
if (mmc_response==0) //切换到SPI成功
{
led2 = 1;
counter=81; //跳出失败尝试次数
}
else led1 = 1; //切换到SPI失败
}
}
//------------------------------------------------------------------------------------
/***********MMC_check();******测试卡是否正常为0***********/
//------------------------------------------------------------------------------------
uchar MMC_check(void)
{
uchar mmc_response;
mmc_response=MMC_sendCmd(MMC_SEND_STATUS,0,0,0,0); //send cmd
MMC_finish();
return (mmc_response&0x93);
}
//------------------------------------------------------------------------------------
/***********MMC_name();**获得卡的名字*****/
//------------------------------------------------------------------------------------
void MMC_name(void)
{
uchar counter,lcd_add,mmc_response=1;
mmc_response=MMC_sendCmd(MMC_SEND_CID,0,0,0,0);
while (mmc_response) //读到数据为0表示正常，就跳出
{
MMC_finish();
mmc_response=MMC_sendCmd(MMC_SEND_CID,0,0,0,0);
led1 = 1; //test point
// prog_flag=1; //错误标记
}
led1 = 0; //test point
for (counter=0;counter<26;counter++)
{
ram_data[counter]=SPI_tx_rx(0xff);
}
MMC_flush(8);
}
//------------------------------------------------------------------------------------
/***********MMC_capactity();******************/
//------------------------------------------------------------------------------------
unsigned long MMC_capactity(void)
{
uchar counter,lcd_add,mmc_response=1;
mmc_response=MMC_sendCmd(MMC_SEND_CSD,0,0,0,0);
while (mmc_response) //读到数据为0表示正常，就跳出
{
MMC_finish();
mmc_response=MMC_sendCmd(MMC_SEND_CID,0,0,0,0);
//LCD_write(mmc_response,1); //test point
led1 = 1; //test point
// prog_flag=1; //错误标记
}
led1 = 0; //test point
for (counter=0;counter<26;counter++)
{
ram_data[counter]=SPI_tx_rx(0xff);
//LCD_write(ram_data[counter],1); //test point
}
MMC_flush(8);
}
